斜拉桥施工阶段索力确定的优化方法

在斜拉桥的施工控制中,为了达到预先给定的成桥状态,需要通过调整施工阶段斜拉索的索力和每个施工阶段的立模标高来实现.采用多目标、多约束的优化方法,以悬臂施工主梁的斜拉桥为例,建立了施工阶段的优化模型,并给出算例.该方法能够在满足中间状态张拉工具的承载能力、内力和位移约束的条件下,达到预先给定的设计状态.

Optimization of Cable Tension during the Construction for Cable-stayed Bridges

In the construction monitoring and controlling of cable-stayed bridge, in order to achieve the finished state that predefined,we always adjust the cable force and the elevation of each construction phase.There are many methods for defining the force of construction phase,such as backward analysis method,forward-backward iteration method,control method of stress-free status,first order optimization method,influence matrix method.Based on the cable-stayed bridge using method of cantilever,the paper establishes the optimization model of construction phase with multi-objective and multi-constraint and gives the example.The method can achieve the finished state that predefined in the restriction condition of carrying capacity of facility,internal force and displacement during construction.